PSI - Issue 24

Lorenzo Berzi et al. / Procedia Structural Integrity 24 (2019) 961–977 Berzi et al./ Structural Integrity Procedia 00 (2019) 000 – 000

971 11

Start

1) Boundary conditions 2) Furnace default state (temperature, conductivity, power..) 3) Process target (temperature cycle)

Load Power

Apply power to furnace

Estimate temperature (node state)

Save temperature (1:i:n) Save conductivity (1:i:n)

Calculate conductivity @ node state

Load conductivity Load Temperature (1:i:n)

Estimate power to ambient

IS T_chamber == T_target?

Recalculate power (PI controller)

NO

Save Power

NO

IS Timer ON?

Set timer ON

YES

Update timer

IS Timer == Target duration?

NO

YES

END

Fig. 7. Flowchart representing the calculation process implemented in the model. The note (1:i:n) means “for all the elements of the array, from 1 to n- th elements”.

Finally, the model has been calibrated on the reference furnace adopted for scenario (CARBOLITE 15/35), whose characteristics are: • Maximum temperature: 1500° C • Usable chamber Height x Width x Depth: 250 x 300 x 465 (mm) • Heat up time to 1400° C: 46 mins • Maximum power: 16 kW • Holding power at 1400° C: 6200 W • Weight: 178 kg • Door: light (visible in datasheet picture) • Volume: 35 l